Intelligent network and method for providing voice telephony over ATM and alias addressing

ABSTRACT

A method may include receiving, at a network device, from a calling party location, an input setup message that includes a called party phone number value; determining whether the input setup message includes a voice telephony over asynchronous transfer mode (VToA) designator; generating an output setup message including an alias address associated with a network gateway that is in communication with a public switched telephone network (PSTN) switch through a plurality of trunk lines when it is determined that the input setup message includes a VToA designator, where the alias address is based on the called party phone number value and indicates a desired trunk line of the plurality of trunk lines; and transmitting the output setup message, the output setup message causing the selection of the desired trunk line of the plurality of trunk lines in order to establish communication between the calling party location and the PSTN switch.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application is a continuation application of patent application Ser. No. 09/768,070, Jan. 22, 2001, now U.S. Pat. No. 7,106,748, issued on Sep. 12, 2006 which claims the benefit of U.S. Provisional Patent Application No. 60/176,928 entitled FAST MSCP, filed Jan. 20, 2000, that named John K. Gallant, Steven R. Donovan, Terry A. Caterisano, Robert H. Barnhouse, David B. McDysan, Saib Jarrar, Thomas Glenn Hall, Jr., and Terry Robb as inventors, and which is hereby incorporated by reference for all purposes.

This application is a continuation of U.S. application Ser. No. 09/768,070, now U.S. Pat. No. 7,106,748, issued on Sep. 12, 2006, and Intelligent Network and Method for Providing Voice Telephony over ATM, and named John K. Gallant, Thomas Glenn Hall, Jr., and Robert H. Barnhouse as joint inventors; U.S. patent application Ser. No. 09/768,077, entitled Intelligent Network and Method for Providing Voice Telephony over ATM and Private Address Translation, and named John K. Gallant, Thomas Glenn Hall, Jr., and Steven R. Donovan as joint inventors; U.S. patent application Ser. No. 09/767,476, entitled Intelligent Network and Method for Providing Voice Telephony over ATM and Closed User Groups, and named Thomas Glenn Hall, Jr. and Steven R. Donovan as joint inventors; U.S. patent application Ser. No. 09/768,069, entitled Intelligent Network and Method for Providing Voice Telephony over ATM and Point-to-Multipoint Connectivity, and named Thomas Glenn Hall, Jr. and Steven R. Donovan as joint inventors; and U.S. patent application Ser. No. 09/766,943, entitled Intelligent Policy Server System and Method for Bandwidth Control in an ATM Network, and named John K. Gallant, Thomas Glenn Hall, Jr. and Steven R. Donovan as joint inventors; all filed on Jan. 22, 2001, and all of which are hereby incorporated by reference for all purposes.

Further, this application discloses subject matter related to the subject matter disclosed in the following co-assigned U.S. patent applications, each of which is incorporated herein by reference: Method and Apparatus for Providing Reliable Communications in an Intelligent Network, filed Jan. 12, 2000, Ser. No. 09/481,910, in the names of: John K. Gallant, Cathleen A. McMurry, Robert H. Barnhouse, Steven R. Donovan, and Terry A. Caterisano; Method and Apparatus for Providing Real-Time Call Processing Services in an Intelligent Network, filed Oct. 20, 1999, Ser. No. 09/421,827, in the names of: Ajay P. Deo, Henry Wang, Sami Syed, and Wendy Wong; Intelligent Call Processing System for a Telecommunications Network (Next Generation Intelligent Network (NGIN)), filed Oct. 19, 1999, Ser. No. 09/420,666, in the names of: Ajay P. Deo, Alan Holmes, Andrew Dugan, Kenneth Fischer, Sami Syed, Terence A. Robb, and Wendy Wong; Method and Apparatus for Supporting ATM Services in an Intelligent Network, filed Oct. 19, 1999, Ser. No. 09/420,657, in the names of: Andrew Dugan, David E. McDysan, and Sami Syed; and Method and Apparatus for Managing Resources in an Intelligent Network, filed Oct. 19, 1999, Ser. No. 09/420,655, in the names of: Alan Holmes, Andrew Dugan, Kelvin Porter, and Terence A. Robb.

TECHNICAL FIELD OF THE INVENTION

This invention relates in general to the field of data networks, telecommunications and more particularly to an intelligent network and method for providing voice telephony over Asynchronous Transfer Mode (“ATM”) and alias addressing.

BACKGROUND OF THE INVENTION

The need for both voice telephony services as well as data services is common. Traditionally, this may only be achieved through the use of separate services. For example, dedicated voice telephony services and dedicated data services are provided over separate and distinct networks. This is a significant disadvantage because of the high expense of maintaining and paying for such separate and distinct services, not to mention the inconvenience and inefficiency introduced because the voice and data services are not integrated.

Packet-switched telecommunications networks may be based on any of a variety of technologies and protocols such as, for example, Asynchronous Transfer Mode (“ATM”), MultiProtocol Label Switching (“MPLS”), Internet Protocol (“IP”), Frame Relay (“FR”), and X.25. Packet-switched telecommunications networks have data packets, cells, frames or blocks (hereinafter “packets” or “cells”) that are either of fixed length or variable length. Although originally designed to transmit data, as opposed to voice or voice encoded data, packet-switched telecommunications networks may be used for voice communications. Some of the packet-switched technologies that may be used for voice communications include, without limitation, Voice Telephony over ATM (“VToA”), Voice over Frame-Relay (“VoFR”), Voice over Digital Subscriber Line (“VoDSL”), and Voice over IP (“VoIP”).

Focusing on VToA when compared to voice communications or voice telephony provided over traditional circuit-dedicated or circuit-switching telecommunications networks, the use of VToA, unfortunately, presents significant problems and disadvantages, especially in view of the fact that the needs of both data communications and voice communications must be met over the same network. For example, VToA does not provide advanced telephony services and features that are commonly found in traditional circuit-dedicated telecommunications networks. Similarly, advanced signaling, also commonly found in traditional circuit-dedicated telecommunications networks, is not available for VToA in the same manner that circuit-dedicated or circuit-switching telecommunications networks.

To setup and establish a Switched Virtual Circuit (“SVC”) to support VToA between a calling party and a called party, various signaling or ATM messages are used within the ATM network. This may be achieved using ATM setup and connect messages. Once ATM signaling has established an SVC, a data connection is defined and data, such as voice encoded data, may be communicated. Voice encoded data may continue to be communicated until one end of the SVC issues a release message (or any similar message that causes a disconnection). At such time, the SVC is released and voice communications ceases. Examples of traditional ATM signaling used to setup and release point-to-point and point-to-multipoint SVCs for telephony applications is illustrated in the book entitled Hands-On ATM by David E. McDysan and Darren L. Spohn, which is incorporated herein for all purposes.

In a traditional telecommunications or voice network, signaling can be in-band or out-of-band. Signaling may be used to setup and establish voice circuits, to provide Intelligent Network (“IN”) or Advanced Intelligent Network (“AIN”) services and features, and to disconnect voice circuits. In an ATM network, where an SVC is established to support VToA, signaling is achieved through the use of ATM messages, such as those used to setup and disconnect SVCs. Unfortunately, such ATM signaling does not support IN or AIN to provide the advanced telephony services and features commonly found in traditional voice telecommunications networks. This significantly reduces the attractiveness of VToA as compared to traditional voice telecommunications networks or even some other data or packet networks capable of providing voice or telephony communications services.

More particularly, a serious problem and drawback of existing VToA is the difficulty or inability to institute advanced calling features on an ATM network-wide basis. Unfortunately, many customary and advanced voice telephony services, which are often available through traditional telecommunications networks designed to transport and support voice telephony, such as circuit-dedicated telecommunications networks, are not available or easily achieved or implemented with VToA. For example, the capability to block calls from one or more locations in a corporation to other locations or areas, such as a specified country or countries, is a valuable service or option that is available in traditional voice telecommunications networks. To implement such a service or feature in a traditional VToA would require that blocking information be provided in various systems and gateways and updated as needed. This is inefficient, cumbersome and expensive to carry out. As is illustrated, this type of a service is problematic to implement in traditional VToA networks and systems. Various other valuable telecommunications services and features, which may be available in traditional telecommunications networks, suffer from the same significant disadvantage illustrated above.

In addition to the significant limitations mentioned above, the administration and maintenance of VToA systems and processes is extremely burdensome and expensive. For example, numerous private and public phone numbers, which change frequently, have to be updated and maintained in various systems and gateways. As moves, adds, changes, and deletions occur, each VToA gateway must be updated with the relevant changes. This is a critical task that is onerous and expensive to perform and fraught with potential errors.

Another disadvantage of VToA becomes apparent, for example, when a call is setup from an origination point on an ATM network using VToA and terminates at a point on the PSTN, or at some point that requires the use of the PSTN to complete the connection. The connection between the ATM network and the PSTN may be provided through a network gateway. The network gateway is often connected to the PSTN through a PSTN switch, such as a Class 3 or Class 5 switch, through multiple trunk lines. In general, the trunk line that carries the call to the PSTN switch determines billing. The problem surrounds the inability to effectively control the routing of the call through a desired or correct trunk line to the PSTN switch to ensure accurate billing.

From a customer's standpoint, if a preferred rate plan is available, the capability to direct such calls through the trunk line the provides the preferred rate plan is essential and can potentially translate into large savings. Otherwise, one or more other rate plans may be chosen by default resulting in significantly higher costs and increased administrative burdens related to such inaccurate billing. From a VToA or ATM network provider's standpoint, the inability to effectively control such routing prevents the provider from being able to effectively serve their customers and provide accurate billing when a VToA call is made to a called party through the PSTN.

SUMMARY OF THE INVENTION

From the foregoing it may be appreciated that a need has arisen for an intelligent network and method for providing VToA and alias addressing that provides intelligent network signaling to support advanced telephony services and features for VToA, while still allowing the benefits of integrating voice and data communications on the same ATM network and providing the capability to easily and conveniently place calls to locations on the PSTN with accurate billing. In accordance with the present invention, an intelligent network and method for providing VToA and alias addressing are provided that substantially eliminate one or more of the disadvantages and problems outlined above.

According to one aspect of the present invention, an intelligent network for use with an ATM network to set up an ATM switched virtual circuit to provide VToA services is provided. The intelligent network includes a multi-service control point, an ATM signaling intercept processor, and a service administration. The multi-service control point receives an input extracted from an input ATM setup message that includes a called party phone number value and a VToA designator, and generates an alias ATM address of a called party CPE that corresponds to a network gateway in communication with a PSTN switch through a plurality of trunk lines and a desired trunk line of the plurality of trunk lines. The multi-service control point generates an output in response that will be used to generate an output ATM setup message that includes the alias ATM address. The ATM signaling intercept processor intercepts the input ATM setup message from an ingress ATM edge switch of the ATM network (which is an edge switch that receives ATM cells or messages into the ATM network, as opposed to an edge switch where ATM cells or messages leave the ATM network), extracts the input from the input ATM setup message, communicates the input to the multi-service control point, receives the output generated by the multi-service control point, generates the output ATM setup message using the output, and communicates the output ATM setup message to the ingress ATM edge switch of the ATM network. The service administration provisions the multi-service control point and the ATM signaling intercept processor.

According to another aspect of the present invention, a method for providing VToA using an intelligent network and a switched virtual circuit over an ATM network is provided. The method includes intercepting an input ATM setup message from an ingress ATM edge switch of the ATM network, extracting information from the input ATM setup message, and analyzing the information to determine if the input ATM setup message set up an SVC for VToA. The method further includes generating an alias ATM address of a called party CPE that corresponds to a network gateway in communication with a PSTN switch through a plurality of trunk lines and a designated trunk line of the plurality of trunk lines, generating an output ATM setup message that includes the ATM address of a called party CPE, and communicating the output ATM setup message to the ingress ATM edge switch of the ATM network.

The present invention provides a profusion of technical advantages that include the capability to efficiently and effectively provide advanced telephony services and functions to VToA through an intelligent network, including the capability to make calls to locations coupled to the PSTN that can be accurately billed. This can substantially increase overall VToA performance and make VToA much more attractive to customers looking to seamlessly and efficiently integrate both data and voice over the same ATM network to achieve substantial savings, but still retain advance telephony capabilities.

Another technical advantage of the present invention includes the capability to utilize an ATM network to provide advanced telephony functions, while efficiently using ATM bandwidth by setting up SVCs to handle phone calls and releasing this bandwidth when the phone call has ended. This results in efficient utilization of ATM bandwidth and may save capital costs by reducing the amount of bandwidth needed.

Yet another technical advantage of the present invention includes the capability to control ATM telephony or voice routing tables in a central location and in the intelligent network layer, as opposed to the prior technique, defined by the various ATM standards bodies, to control ATM telephony at the end points. This significantly reduces overall costs to operate a telecommunications network to support VToA, and significantly reduces the opportunity for erroneous information entering the network. This advantaged is achieved by separating the ATM intelligence from the ATM switching.

Other technical advantages are readily apparent to one skilled in the art from the following figures, description, and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention and the advantages thereof, reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description, wherein like reference numerals represent like parts, in which:

FIG. 1 is a diagram that illustrates a telecommunications network for providing VToA services, such as alias addressing, using an ATM switched virtual circuit according to an embodiment of the present invention;

FIG. 2 is a line diagram that illustrates the signaling and call flow performed by the intelligent network for a VToA call, including the setup, connect, and release portions, according to an embodiment of the present invention;

FIG. 3 is a block diagram that illustrates an intelligent network used at the ingress side of an ATM network for providing VToA services using an ATM switched virtual circuit;

FIG. 4 is a block diagram that illustrates the intelligent network used at the egress side of the ATM network for providing VToA services using an ATM switched virtual circuit;

FIG. 5 is a diagram, similar to FIG. 1, that illustrates a telecommunications network for providing VToA services and alias addressing using an ATM switched virtual circuit between a calling party location of the ATM network and a called party location of the PSTN;

FIG. 6 is a flowchart that illustrates a method for providing VToA and alias addressing using an intelligent network and a switched virtual circuit over an ATM network; and

FIGS. 7 a and 7 b are flowcharts that illustrate a method for providing VToA and alias addressing using an intelligent network and a switched virtual circuit over an ATM network, according to another aspect of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

It should be understood at the outset that although an exemplary implementation of the present invention is illustrated below, the present invention may be implemented using any number of techniques, whether currently known or in existence. The present invention should in no way be limited to the exemplary implementations, drawings, and techniques illustrated below, including the exemplary design and implementation illustrated and described herein.

FIG. 1 is a diagram that illustrates a telecommunications network 10, which also may be referred to as an intelligent ATM network or as a Smart Bandwidth on Command (“SBoC”) network, for providing Voice Telephony over ATM (“VToA”) services using an ATM Switched Virtual Circuit (“SVC”) according to an embodiment of the present invention. The description below in connection with FIGS. 1-4 provides a discussion of the operation of the telecommunications network 10 so that the alias addressing aspect of the present invention may be described more fully in connection with the description accompanying FIGS. 5, 6, 7 a and 7 b.

The telecommunications network 10 includes an intelligent network 12, which also may be referred to as an intelligent network layer, in communication with an ATM edge switch 14 and an ATM edge switch 16 of an ATM network 18. A calling party location 20 is illustrated in communication with the ATM edge switch 14, and a called party location 22 is shown in communication with the ATM edge switch 16.

The intelligent network 12 is operable to intercept and process ATM signaling messages provided to the ATM edge switch 14 and the ATM edge switch 16. This architecture allows the intelligent network 12 to provide various telephony features and services, including advanced telephony features and services, to VToA provided over an ATM network, such as the ATM network 18, through an SVC.

It should be noted that the ATM edge switch 14 and the ATM edge switch 16 may be considered to be part of the ATM network 18. Of course, the ATM network 18 may include any of a variety of ATM switches and/or ATM network elements or devices and may geographically span or cover virtually any region. The ATM switches of the ATM network 18, including the ATM edge switch 14 and the ATM edge switch 16, may be provided by any of a number of ATM switch manufacturers, such as, for example, NEWBRIDGE and ALCATEL. Of course, multiple connections can be provided to the ATM network 18 through any of a variety of edge switches, such as at the ATM edge switch 14. In order to simplify the illustration of the present invention, including the illustration of setting up a VToA call originating from a calling party, only two connections to the ATM network 18 are illustrated in FIG. 1 and include the calling party location 20 and the called party location 22.

The calling party location 20 and the called party location 22 may include any of a variety of end-user devices and Customer Premises Equipment (“CPE”). For example, the calling party location 20, which could be referred to as an ingress location since this is the calling location, includes a telephony device 24 and a CPE 26. Similarly, the called party location 22 is illustrated with a telephony device 28 and a CPE 30.

Of course, any of a number of arrangements may be provided at the calling party location 20 and the called party location 22. In one embodiment, these locations may also include Data Communications Equipment (“DCE”) to support traditional ATM data communications. As is apparent, the capability to communicate both data and voice over the same ATM network provides significant advantages and conveniences that normally result in substantial savings. This arrangement in combination with the present invention allows both VToA calls, with intelligent network features and services provided or controlled by the intelligent network 12, and ATM data transfers to be supported using the same ATM network, such as the ATM network 18. For example, a business enterprise that has multiple locations may significantly benefit by providing voice communications, with intelligent networking features, using VToA and data communications all through the same ATM network.

In one embodiment, the telephony device 24 and the telephony device 28 may be provided as a telephone, a personal computer, a computer network, answering machine, video conferencing equipment, or any of a variety of other devices operable to support or provide telephony functionality. The CPE 26 and the CPE 30 may be implemented using any of a number of devices. For example, and without limitation, the CPE 26 and the CPE 30 may be implemented as a router, a PBX with ATM signaling capability, an enterprise gateway, or a network gateway. The CPE 26 and the CPE 30 may be implemented, in one embodiment, using a CPE device provided by ACCELERATED NETWORKS.

The communications link between the ATM edge switch and the calling party or called party location may be provided using any number of available links, such as dedicated links or leased lines. According to an aspect of the present invention, whenever a customer location desires to set up or establish an SVC to support VToA, a signaling ATM message, such as an ATM setup message, is provided from the customer location to the associated ATM edge switch of the ATM network 18. For example, if the calling party location 20 desires to establish an SVC through the ATM network 18, an ATM setup message may be sent from the calling party location 20 to the ATM edge switch 14. This ATM setup message may be used to designate that this SVC is being setup or established to provide VToA. In one embodiment, an ATM setup message is sent from the calling party location 20 to the ATM edge switch 14 using a predefined or predetermined protocol such that a designated value, which may be referred to as a VToA designator, is included in the content or payload of the ATM setup message to indicate that this SVC is being set up or established to support VToA.

In one embodiment, the telephony device 24 is provided as a telephone or personal computer with telephony software, and the CPE 26 is provided as an enterprise gateway that is provisioned with a special ATM address to identify the CPE 26 as an ATM device. An ATM setup message may be generated by a calling party by using the telephony device 24 to enter a phone number, which may be referred to as a called party phone number value. The CPE 26 generates the ATM setup message, which may be referred to as an input ATM setup message, in response to initiate an SVC for VToA by saving various values in the content of the ATM setup message.

The content may be stored in an ATM setup message using various designated areas, which may be referred to as fields, addresses or parameters. The content that is stored in each such parameter may be referred to as a value. An example of some of the parameters that may be present in an ATM setup message is provided in the following table (Table1):

TABLE 1 ATM SETUP MESSAGE PARAMETERS Called Party Number Called Party Subaddress Calling Party Number Calling Party Subaddress In a preferred embodiment of the present invention, the ATM address of the CPE 26, which may be referred to as the ATM address of the calling party CPE, is stored in the ATM setup message as the calling party number parameter, the telephone number associated with the telephony device 24, which may be referred to as the calling party phone number value, is stored in the ATM setup message as the calling party subaddress parameter, a special or designated number or address, which may be referred to as the VToA designator, is stored in the called party number of the ATM setup message, and the dialed or called telephone number, which may be referred to as the called party phone number value, is stored in the called party subaddress of the ATM setup message.

This input ATM setup message is then provided to the ATM network 18 at the ATM edge switch 14. In essence, this ATM setup message instructs the ATM network 18 to setup an SVC between the ATM address of the CPE 26 and the special or designated ATM address that is provided as the called party number of the ATM setup message. This special or designated ATM address or number may also be referred to as a VToA designator. This is a predetermined or predefined number which will be used by the intelligent network 12 to indicate that this setup message request for an SVC is to provide VToA and hence the advance telephony services or features of the present invention should be applied by the intelligent network 12.

The input ATM setup message is received at the ATM edge switch 14. The ATM edge switch 14, just like the ATM edge switch 16, may be thought of as divided into two portions, a device side portion and a network side portion. The device side is the side where a customer or client interfaces, generally through a CPE, with the ATM network 18. Signaling messages received at the device side of the ATM switch 14 from the CPE 26 are intercepted by the intelligent network 12. The intelligent network 12, which will be described more fully below in connection with FIG. 1 and FIGS. 3 and 4, receives the input ATM setup message generated by the CPE 26 and analyzes its contents. From this analysis, the presence of the VToA designator, which in one embodiment may be stored in the called party number parameter of the ATM setup message, indicates that this input ATM setup message is a request to setup an SVC for VToA.

Once it is determined that the signaling message is a request to setup or establish an SVC for VToA, the intelligent network 12 will, preferably, perform as much processing as possible on the ATM setup message at the ingress ATM edge switch. Before discussing some of the various intelligent network services or features that may be provided by the present invention, the processing of the input ATM setup message is discussed. In one embodiment, the intelligent network 12 locates the called party phone number value and performs a table search or “look-up” to determine a corresponding ATM address, such as the ATM address for a destination CPE or device, such as a termination gateway, an enterprise gateway or a network gateway. This ATM address may be referred to as the ATM address of the called party CPE. In a preferred embodiment, the called party phone number value is retrieved from the called party subaddress parameter to perform the necessary functions to find the associated destination ATM address. Once located, this destination ATM address may be provided so that a modified or output ATM setup message may be generated to establish an SVC to support VToA from the CPE 26 to the destination ATM device. In a preferred embodiment, the calling party phone number value is stored in the calling party subaddress parameter of the input ATM setup message, and the ATM address of the calling party CPE or device is stored in the calling party number parameter of the input ATM setup message.

When a VToA call originates from the calling party location 20 and terminates at the called party location 22, the ATM edge switch 14 may be referred to as the ingress ATM switch while the ATM edge switch 16 may be referred to as the egress ATM edge switch. Generally, each such ATM edge switch may function as either an ingress or an egress ATM edge switch.

The output ATM setup message is transmitted from the intelligent network 12 to the network side of the ATM edge switch 14 where it is sent to the ATM network 18. The output ATM setup message is transmitted through the ATM network until it arrives at the network side of the ATM edge switch 16. The intelligent network 12 intercepts and processes this ATM message and, generally, will provide the ATM message back to the device side of the ATM edge switch 16 at the appropriate port so that it will be communicated to the CPE 30 of the called party location 22. If the intelligent network 12 modifies or changes the output ATM setup message, the resulting ATM message may be referred to as a destination or gateway ATM setup message.

A preferred embodiment of an implementation of the intelligent network 12 is provided next. The intelligent network 12, as shown in FIG. 1, includes an ATM signaling intercept processor (“ASIP”) 40, which is associated with the ATM edge switch 14 that is shown serving as an ingress ATM edge switch, an ASIP 42, which is associated with the ATM edge switch 16 that is shown serving as an egress switch, a multi-service control point (“MSCP”) 44 in communication with the ASIP 40, an MSCP 46 in communication with the ASIP 42, and a service administration 48. The service administration 48, in the embodiment shown in FIG. 1, is operable to provision the ASIP 40, the MSCP 44, the ASIP 42, and the MSCP 46. In provisioning these elements of the intelligent network 12, the service administration 48 will, preferably, provide user interfaces to each such element. In a preferred embodiment, the service administration 48 also maintains a database of record, which may be the same as or similar to the database shown in the MSCP 44 and the MSCP 46.

The ASIP 40 and the ASIP 42 will generally be associated with a designated ATM edge switch, such as the ATM edge switch 14 and the ATM edge switch 16. The MSCPs, such as the MSCP 44 and the MSCP 46, may interface or work in conjunction with one or more ASIPs. In an alternative embodiment, one MSCP interfaces and works with all ASIPs of the intelligent network 12. All of the MSCPs of the intelligent network 12 may provide the same or essentially the same functionality.

The ASIP 40 and the ASIP 42, generally, function to intercept ATM signaling messages, such as an ATM setup message, an ATM connect message, and an ATM release message. The ASIP 40 and the ASIP 42 intercept and process ATM signaling messages from the associated switch whether the signaling messages are provided from the device side or from the network side of the associated ATM edge switch.

It should be noted that the ASIP 40 and the ASIP 42 are both capable of or operable to receive signaling messages provided through their associated ATM edge switch in either direction. For example, although the call setup illustrated in FIG. 1 illustrates a VToA call that originates at the calling party location 20 and terminates at the called party location 22, the ASIP 40 and the ASIP 42 perform their functions when the ATM signaling messages are traveling in the opposite direction, such as if the called party location 22 originates a VToA call through an SVC to the calling party location 20. Once the ATM signaling message, such as the input ATM setup message, is intercepted, an input is generated by the ASIP and the input is provided to the associated MSCP, such as the MSCP 44 and the MSCP 46.

The MSCP 44 and the MSCP 46 both contain various applications that can provide intelligent network and even advanced intelligent network VToA services and features. The applications will preferably be provided as software applications that provide the desired logic and algorithms to achieve the desired intelligent network service or feature. In performing these various services and features, the MSCPs must access various information that may include, for example, ATM addresses, associated telephone numbers, customer profiles, user profiles, and any of a variety of other needed information to support or provide the desired service and feature.

As a result of the processing performed by the MSCP 44 and the MSCP 46, an output is generated. The output is then provided back down, as represented by the arrows extending from the MSCPs to their associated ASIPS, so that the ASIP 40 and the ASIP 42 may assemble the output to generate a resulting ATM message. The ASIP, in a preferred embodiment, also provides call modeling functionality that allows multiple calls to be modeled.

To illustrate the operation of the intelligent network 12 to provide intelligent network functionality to the telecommunications network 10 and the ATM network 18, the establishment of an SVC for VToA is illustrated next. Assuming that the calling party location 20 initiates the establishment or setup of an ATM SVC for VToA with the telephony device 28 of the called party location 22, the CPE 26 of the calling party location 20 responds to the request by the telephony device 24 to setup a phone call. The CPE 26 generates an input ATM setup message and provides this input ATM setup message to the ATM edge switch 14. The ATM edge switch 14 may be thought of as having a device side portion and a network side portion, just like the ATM edge switch 16. The input ATM setup message is received at the device side of the ATM edge switch 14 and is intercepted by the ASIP 40.

The ASIP 40 processes the input ATM setup message and, using one or more of the various values that may be stored within or in association with the input ATM setup message, generates an input. The input is then communicated or provided to the MSCP 44. The MSCP 44 may provide any number of telephony services and features. The MSCP 44, however, must analyze the input to determine if the input ATM setup message is a request for an SVC for VToA. In a preferred embodiment, a predefined or predetermined value is stored within the called party number parameter of the input ATM setup message. The value provided within this called party number parameter of the input ATM setup message is analyzed to determine if the input ATM setup message is requesting an SVC for VToA. In one embodiment, the value stored within the called party number parameter of the input ATM setup message may be referred to as a VToA designator, i.e., designating that the input ATM setup message is a request for an SVC for VToA. It should be understood, however, that any of a variety of ATM setup messages parameters may be used to provide this functionality. The CPE 26, which originally generated the input ATM setup message, will store the appropriate VToA designator value within the appropriate parameter, such as the called party number parameter, when generating the input ATM setup message so that the appropriate MSCP associated with the ingress ATM edge switch will recognize the input ATM setup message as one requesting an SVC for VToA.

If the VToA designator is not found, the MSCP 44 will provide an output to the ASIP 40 and the ATM setup message will continue as if a request is being made to establish or setup an SVC for a data transfer. If the VToA designator is found, additional service and feature processing may proceed. In order for the SVC for VToA to be established, a called party phone number value, which will be included as part of the input from the ASIP 40, will need to correlated by the MSCP 44 with a corresponding value that is equal to the ATM address of the called party CPE, which is in this case is the CPE 30. If the called party phone number value is not found, the call may fail or be rejected. The ATM address of the called party CPE and the called party phone number value, along with any other values generated as a result of the processing that may have occurred through any of a variety of services and features that may be provided by the MSCP 44, results in the MSCP 44 generating an output. The output is received and used by the ASIP 40 to generate or assemble an output ATM setup message.

The output ATM setup message may then be provided to the network side of the ATM edge switch 14 where it is then routed through the ATM network 18 using traditional or available ATM protocols until the output ATM setup message is received at the network side of the ATM edge switch 16. Of course, the ATM network 18 may include any of a variety or any number of ATM switches, such as the ATM switches 18 a, 18 b, 18 c, and 18 d. It should also be noted that any number of additional ATM edge switches may be connected to the ATM network 18 through virtually any available ATM switch or ATM network element.

The output ATM setup message is received at the network side of the ATM edge switch 16 where the ASIP 42 intercepts the signaling message and generates an input. The input is provided from the ASIP 42 to the MSCP 46. The MSCP 46, similar to the MSCP 44, analyzes the input to determine what, if any, processing is needed. In this case, the MSCP 46 finds the ATM address of the called party CPE, which in this case is the CPE 30, in the input and provides appropriate routing information and generates a corresponding output of the MSCP 46. Of course, various other processing may also occur, depending on the particular feature or service.

The ASIP 42 receives the output from the MSCP 46 and generates or assembles another setup message. In one embodiment, the resulting ATM setup message may be referred to as a destination or gateway ATM setup message since it will ultimately be provided to the CPE 30, which may be implemented as an enterprise gateway, a network gateway or any of a variety of telephony access devices. If the output ATM setup message is not changed by the output from the MSCP 46, the resulting ATM setup message may still be referred to as the output ATM setup message and it is provided to the device side of the ATM edge switch 16, just like any destination or gateway setup message, where it is then provided to the CPE 30.

At the CPE 30, the appropriate telephony device, in this case telephony device 28, is contacted so that a call may be established or setup. In response, the CPE 30 may generate an ATM connection message or any other ATM signaling message which is available and would be known of ordinary skill in the art. For example an ATM connection message and an ATM release message may be generated during this VToA call.

FIG. 2 is a line diagram 100 that illustrates the signaling and call flow performed by the intelligent network for a VToA call, including the setup, connect, and release portions of the VToA call, according to an embodiment of the present invention. The VToA call is achieved through the use of an ingress device 102, an ingress ATM edge switch 104, an ingress ASIP 106, and ingress MSCP 108, an ATM network 110, an egress ATM edge switch 112, an egress ASIP 114, an egress MSCP 116, and an egress device 118. Starting in the upper lefthand portion of FIG. 2, an input ATM setup message is generated and provided from the ingress device 102 to the ingress ATM edge switch 104.

The ingress device 102 may be any of a variety of devices such as the CPE 26 of FIG. 1, a router, a PBX, a telephony access device, or a gateway, such as an enterprise gateway or a network gateway to provide access to the Public Switched Telephone System (“PSTN”). Generally, the ingress device 102 must simply have the capability to generate an input ATM setup message that includes a VToA designator stored in the called party number parameter of the input ATM setup message (or other location or parameter depending on the intelligent network design), and a called party phone number value stored in the called party subaddress parameter of the input ATM setup message. In other embodiments, the input ATM setup message may also contain the value of the ATM address of the calling party CPE and the calling party phone number value. In such a case, these values are preferably stored in the calling party number parameter and the calling party subaddress parameter, respectively, of the input ATM setup message. Line 120 represents the communication of the input ATM setup message from the ingress device 102 to the ingress ATM edge switch 104.

It should be noted that the line diagram 100 illustrates only the basic signaling and call flow of a VToA call. Other signals or messages, which would be understood by one of ordinary skill in the art and normally provided automatically as part of one or more ATM specifications such as the ATM Forum UNI 3.1 and/or UNI 4.0, may include various acknowledgment signals or messages, such as connect acknowledge, a call proceeding message, and a release complete message.

The ingress ATM edge switch 104 receives the input ATM setup message and communicates it to the ingress ASIP 106 as represented by a line 122. The ingress ASIP 106 provides various values and addresses contained within various parameters of the input ATM setup message and provides those values to the ingress MSCP 108 as shown in a line 124. For example, the ingress ASIP 106 may provide the VToA designator, which may be stored in the called party number parameter of the input ATM setup message, and the called party phone number value, which may be stored in the called party subaddress parameter of the input ATM setup message, to the ingress MSCP 108. The VToA designator is used in the present invention to indicate that a setup message is requesting to set up an SVC for VToA.

After the ingress MSCP 108 confirms, by analyzing the value of the VToA designator, that an SVC for VToA is requested, the ingress MSCP 108 may perform any of a variety of advanced telephony functions to provide VToA services and features as desired or requested. If a VToA designator is not found by the MSCP 108 during setup, an ATM data call may be assumed. The ingress MSCP 108 may provide any of a variety of advanced telephony functions to provide VToA services and features. Example of some of these services and features include Default Calling Party Number Handling (“DCH”), Source Address Validation (“SAV”), Customer Port Maximum Call Attempt Rate Limit (“CMR”), Closed User Group (“CUG”), Destination Address Screening (“DAS”), Source Address Screening (“SAS”), Customer Port Maximum Burst Size Limit (“CMDS”), Customer Port Aggregate Bandwidth Limit (“CBW”), Customer Port Maximum Concurrent Calls in Progress Limit (“CMC”), Private Address Translation (“PAT”), Customer Port Service Class Selection (“CSCS”), and Point-to-Multipoint, Root-Initiated Connections (“P2MR”). Preferably, most of the intelligent network features and processing are performed at the ingress MSCP 108. In some cases, such as, for example, PAT, additional intelligent networking service or feature processing must be performed at other locations, such as the egress MSCP 116.

A brief summary of the calling services and features mentioned above is provided. DCH provides logic to handle input ATM setup messages in which a calling party phone number value is not provided. In such a case, the DCH feature may substitute a default calling party phone number value. SAV determines whether a user is requesting a call through an authorized or proper port. VToA privileges may be given on a per port basis, and the SAV feature may insure that only authorized users are allowed to access the ATM network through particular network ports, such as a physical port or a Customer Logic Port (“CLP”). CMR may be used to verify that the number of access attempts at a CLP does not exceed a provisioned or predetermined rate.

The CUG feature allows various users of an enterprise or customer to be partitioned into defined user groups. This allows various policies or privileges to be enforced on a group basis. A basic feature of CUG is to provide the capability to restrict calls to other users outside of the CUG or within certain other closed user groups. The DAS and SAS services or features provide call-screening lists that allow either the originating party or the terminating party to define the addresses to which calls can be made or from which calls can be received, respectively. In one embodiment, two types of call-screening lists may be supported for each user or subscriber that include a group list and a user list. This allows these services or features to be provided either on a group basis, an individual user basis, or both. The CMBS and CBW services or features provide a mechanism in which burst-size and bandwidth requests may be limited. This may prevent a few users from allocating large amounts of bandwidth and ATM network capability at the expense of other users. Similarly, the CMC feature limits the number of connections through a particular port.

The PAT service provides the significant advantage of allowing a customer to keep its own ATM numbering or addressing scheme. PAT is an example of a feature that requires ATM intelligent network processing, according to an embodiment of the present invention, at both the ingress ATM edge switch and the egress ATM edge switch. The CSCS feature provides a mechanism to configure the service classes available for a particular customer, which may be set up through an individual CLP. As an example, CSCS may support the capability to configure various classes of service such as Continuous Bit Rate (“CBR”), Variable Bit Rate, Non-Real Time (“VBR-NRT”), Variable Bit Rate, Real Time (“VBR-RT”), Unspecified Bit Rate (“UBR”), and Available Bit Rate (“ABR”). The P2MR feature or service allows for point-to-multipoint VToA to be provided using an SVC. These types of connections are unidirectional and, just as with point-to-point connections, can support virtually any type of content such as voice or video.

Referring back to FIG. 2, the ingress MSCP 108 will provide any of a number of various features, such as those just described, by performing any of a number of database or table queries and executing any of a number of applications or algorithms. As a result, the ingress MSCP 108 provides an output back to the ingress ASIP 106 as represented by the line 126. This output will be used by the ingress ASIP 106 to generate an output ATM setup message. The output will normally include an ATM address of the called party CPE. The CPE may be implemented as, for example, an enterprise gateway, a network gateway, or virtually any other telephony access device. The ingress ASIP 106 assembles or generates the output ATM setup message and provides this message to the ingress ATM edge switch 104 as represented by a line 128 of FIG. 2.

The output ATM setup message then passes through the ATM network 110 until it reaches the egress ATM edge switch 112. This is represented by a line 130. Similar to how the input ATM setup message was processed by the ingress devices, the egress devices process the output ATM setup message. Initially, the output ATM setup message is intercepted by the egress ASIP 114 once it reaches the egress ATM edge switch 112. This is represented by a line 132.

The egress ASIP 114 transfers various input values from the output ATM setup message to the egress MSCP 116. The egress MSCP 116 may provide various processing, but as mentioned above, most of the intelligent network service or feature processing will, preferably, be performed at the ingress side. The egress MSCP, in one embodiment, receives the ATM address of called party CPE and determines which port of the egress ATM edge switch 112 the setup message should be provided so that it may be communicated to the egress device 118. The egress MSCP 116, depending on the processing performed, may modify the input provided from the egress ASIP 114 and generate an output that is provided back to the egress ASIP 114, which is represented by a line 136 in FIG. 2.

The egress MSCP 116 may provide various applications, logic, and the like to carry out any of a variety of advanced intelligent network features. The egress MSCP 116 may contain various data provided in tables or databases, or have the capability to access data external to the egress MSCP 116. It should also be noted that the features or services provided by the egress MSCP 116 and the ingress MSCP 108 may be achieved by the same MSCP. The ASIPs, however, will generally be associated or dedicated to each ATM edge switch that the ASIP serves. It should also be noted that although the egress MSCP 116 is shown in FIG. 2 serving as an egress device 118, whenever the egress device 118 originates an SVC for VToA over the ATM network 110, the egress MSCP 116 will generally function as just described for the ingress MSCP 108.

The egress device 118, just as with the ingress device 102 described above, may be virtually any available CPE device such as, for example, an enterprise gateway, a network gateway, or a telephony access device. If the egress device 118 is an enterprise gateway, the egress MSCP 116 will generally not modify the input provided to it from the egress ASIP 114 and thus the egress ASIP 114 will receive an output from the egress MSCP 116 that is the same or similar as the input. In such a case, the output ATM setup message is provided to the egress ATM edge switch 112 where it is then provided to the egress device 118 to establish an SVC for VToA. This is represented by lines 138 and 140.

If the egress device 118 is a network gateway, or some similar device, the egress MSCP 116 may perform database operations to properly route the setup message to the egress device 118. In such a case, the egress MSCP 116 generates appropriate output and provides this output to the egress ASIP 114, as represented by the line 136. The egress ASIP 114 then assembles or generates another ATM setup message, which may be referred to as a destination or gateway ATM setup message, and provides this setup message to the egress ATM edge switch 112, which then provides such message to the egress device 118. This is represented by lines 138 and 140.

Once a party answers a telephony device, the egress device 118 generates an ATM connect message. This connect message is illustrated in FIG. 2 by lines 142-162. The ATM connect message propagates through the ATM network 110 until a connection is made between the ingress device 102 and the egress device 118. The ATM connection message is processed, similar to the ATM setup message, such that the ingress and egress ASIPs and MSCPs intercept and analyze each such signaling messages. At this point, an SVC has been established between the ingress device 102 and the egress device 118 through the ATM network 110 to provide VToA with intelligent network services and features. The MSCP and the ASIP may also provide call modeling to track various calls.

Once a party desires to end the call, which can come from either the ingress device 102 or the egress device 118, an ATM release message is generated. In FIG. 2, this ATM release message is generated by the ingress device 102. This proceeds similar to the connect and setup messages and is illustrated in FIG. 2 by the lines 164-186. This ends the VToA call.

FIG. 3 is a block diagram that illustrates an intelligent network 300 used at the ingress side of an ATM network for providing VToA services using an ATM switched virtual circuit. The intelligent network 300 includes an ASIP 302, an MSCP 304, and a service administration 306. A remote, external database 308 is also shown in FIG. 3 with a communications link with the MSCP 304. The database 308 is provided to illustrate the fact that the MSCP 304 may rely on external databases or tables. The service administration 306 may also contain various tables or databases that the MSCP 304 accesses or that is provided to the MSCP 304 as a database of record.

The ASIP 302 interfaces with an ATM edge switch, not shown in FIG. 3, and is capable of intercepting and receiving ATM message signals, such as ATM setup, connect, and release messages. When the ATM edge switch serves as the ingress ATM edge switch, the ASIP 302 receives ATM signaling messages from the device side of the ingress ATM edge switch. To establish an SVC to provide VToA, the ingress ATM edge switch provides an input ATM setup message from its device side to the ASIP 302. In addition to the functions described next, the ASIP 302 may also provide call modeling functionality. The ASIP 302 receives the input ATM setup message and, in one embodiment, extracts various information, such as the called party phone number value and the VToA designator, and communicates this information to the MSCP 304 as an input. The communications link between the MSCP 304 and the ASIP 302 may be a local connection or it may be a remote or long distance link. In one embodiment, the called party phone number value is stored in the called party subaddress parameter of the input ATM setup message and the VToA designator is stored in the called party number parameter of the input ATM setup message.

The MSCP 304, which also may be referred to as a policy server, includes various applications 310 and a database 312. The applications 310 may include any of a variety of software programs, logic, and algorithms that serve to provide VToA services and features. The database 312 may include any of a variety of tables and information useful to provide VToA services and features.

The service administration 306 is capable of provisioning the MSCP 304, and in some embodiments, the ASIP 302. The service administration 306 may control or synchronize multiple MSCPs ensure that data or information in various MSCPs of the ATM network are coordinated and consistent.

The MSCP 304 receives the input from the ASIP 302 and can provide any number of VToA services and features. In order to establish an SVC for VToA, the MSCP 304 must determine if the input, provided by the ASIP 302 from the input ATM setup message, is a request to establish an SVC for VToA. If not, processing of an ATM data call proceeds. The MSCP 304, in a preferred embodiment, determines that the input ATM setup message is requesting an SVC to establish VToA by looking for the presence of the VToA designator. If present, the MSCP 304 uses the database 312 to determine the ATM address of the called party CPE using the called party phone number value provided as an input from the ASIP 302. The MSCP 304 may provide any of a variety of additional services and features, such as those described above in connection with FIG. 2, and will, generally, use the applications 310 and the database 312 to achieve these services and features. The MSCP 304 generates an output in response to the processing just described and communicates this output to the ASIP 302. If a VToA is to be set up, the output will generally include at least the called party phone number value and the ATM address of the called party CPE.

To illustrate some of the processing that may be performed by the MSCP 304 on the input provided by the ASIP 302, the following examples are provided. Assuming that an ATM address of the calling party CPE is provided as part of the input ATM setup message, and preferably as the calling party number parameter, the ASIP 302 may provide this as an input to MSCP 304. The value of this address is then used to determine what services or features are available for this particular address. The MSCP 304 may also, by examining the value of the called party phone number value provided in the called party subaddress parameter of the input ATM setup message, determine or perform database queries to determine if the requested call is to a private number, a long distance or international number, a local number, an emergency number, etc. In a preferred embodiment, this is performed using various tables, which may be provided in the database 312, and by examination of the prefix digits of the called party phone number value. The MSCP 304 may also remove or add prefix or suffix digits to the called party phone number value. The result of any such prefix/suffix manipulation results in a revised called party phone number value. This revised number may then be used to determine a corresponding ATM address of the called party CPE.

The MSCP 304 may also, depending on the features and capabilities associated with one or more of the calling party phone number value, the ATM address of the calling party CPE, and the called party phone number value, consult a database or table of provisioned information to determine whether the called party phone number value should be translated to some other phone number and whether permission to make such a call is available. For example, the destination party may have forwarded their phone number to another phone number. In such a case, the MSCP 304 may determine that the called party phone number value should be translated to another called party phone number value. In such a case, the MSCP 304 may request whether the calling party has permission or sufficient rights to place a call to the translated or forwarded called party phone number.

As a result of the various manipulations and features and services provided by the MSCP 304, an output is provided to the ASIP 302. The ASIP 302 assembles or generates an output ATM setup message using the output from the MSCP 304. In a preferred embodiment, the resulting called party phone number value is stored in the called party subaddress parameter of the output ATM setup message, and the original calling party phone number value is stored in the calling party subaddress of the output ATM setup message. In addition, the output ATM setup message may include the ATM address of the calling party CPE stored in the calling party number parameter, and the calling party phone number value stored in the calling party subaddress. As an example, the following two tables illustrate various parameters and corresponding values or addresses of the input ATM setup message (Table 2) and the output ATM setup message (Table 3).

TABLE 2 INPUT ATM SETUP MESSAGE PARAMETERS VALUE Called Party Number VToA designator Called Party Subaddress Called party phone number value Calling Party Number ATM address of the calling party CPE Calling Party Subaddress Calling party phone number value

TABLE 3 OUTPUT ATM SETUP MESSAGE PARAMETERS VALUE Called Party Number ATM address of the called party CPE Called Called Party Subaddress Called party phone number value Calling Party Number ATM address of the calling party CPE Calling Party Subaddress Calling party phone number value The ASIP 302 provides the output ATM setup message to the ATM network side of the ATM ingress edge switch where the output ATM setup message is provided to the ATM network and eventually delivered at the appropriate egress ATM edge switch to establish the SVC for VToA.

FIG. 4 is a block diagram that illustrates the intelligent network 300 used at the egress side of the ATM network, such as the ATM network 18 of FIG. 1, for providing VToA services and features using an ATM switched virtual circuit. Thus, in one embodiment of the present invention, the ASIP 302 and the MSCP 304 may provide intelligent network services and features to an ATM edge switch serving as an ingress ATM edge switch and an egress ATM edge switch, depending on how a VToA call is established.

When serving the associated ATM edge switch that is functioning as an egress switch, the intelligent network 300 receives the output ATM setup message from the ATM network. As mentioned above, the egress ATM edge switch may be considered part of the ATM network. The egress ATM edge switch provides the output ATM setup message to the ASIP 302.

The ASIP 302 intercepts the output ATM setup message from the egress ATM edge switch and generates or extracts an input to provide to the MSCP 304. This input may include any of a variety of values provided by the output ATM setup message. For example, the input may include the ATM address of the called party CPE.

At the egress side, the MSCP determines the appropriate port or CLP of the egress ATM edge switch in which to route the ATM setup message. The MSCP 304, however, may provide any of a variety of services and features, and may provide additional routing information.

In the event that the MSCP 304 generates an output such that the ASIP 302 assembles or generates an ATM setup message that is different from the output ATM setup message, this new ATM setup message may be referred to as a destination or gateway ATM setup message. In any event, the ASIP 302 provides the ATM setup message to the device side of the egress ATM edge switch so that the ATM setup message may be provided to the appropriate CPE. Of course, the CPE may be provided as any number of devices such as an enterprise gateway, a network gateway, or various other telephony equipment. The CPE will generally interpret the ATM setup message by looking at the called party phone number value stored, preferably, in the called party subaddress parameter of the ATM setup message to determine how to make the final connection to the appropriate telephony device.

FIG. 5 is a diagram, similar to FIG. 1, that illustrates a telecommunications network 10 for providing VToA services and alias addressing using an ATM switched virtual circuit between a calling party location of the ATM network and a called party location of the PSTN. The various network elements, devices and switches of the telecommunications network 10 are as described in connection with FIG. 1, except the called party location 22. The called party location 22 is provided in FIG. 5 with a telephony device 28 in communication with the telecommunications network 10 through the PSTN and a network gateway.

The operations of the telecommunications network 10 as shown in FIG. 5 as compared to the operation of the telecommunications network 10 of FIG. 1 are the same except that the MSCP 44 as shown in FIG. 5 provides a service or feature known as alias addressing. This service or feature, which is described below in connection with FIGS. 6, 7 a, and 7 b, provides an alias ATM address of the called party CPE, which in this case is a network gateway 30, that corresponds to: (i) the ATM address of the network gateway 30, which is in communication with a PSTN switch through a plurality of trunk lines, and (ii) a designated one of the plurality of trunk lines. This provides the significant advantage of allowing a desired or designated trunk line to be selected so that the PSTN switch will correctly calculate billing of such a VToA call.

The called party location 22 includes a network gateway 30l, a PSTN 60 with a PSTN switch 68, and a telephony device 28. A plurality of trunk lines couple the network gateway 30 with the PSTN switch 68. The plurality of trunk lines are represented in FIG. 5 through a trunk line 62, a trunk line 64, and a trunk line 66.

In operation, the network gateway 30 receives an output ATM setup message from the egress ATM edge switch 16. The network gateway 30 is provisioned or has the capability of analyzing the output ATM setup message, which includes the alias addressing, and determining which of the plurality of trunk lines is designated to communicate or setup the connection with the PSTN switch 68 of the PSTN 60. Generally, the trunk line in which a call or connection is received by the PSTN switch 68 will determine how the PSTN switch 68 will determine or calculate a bill or billing rate for such a connection. For example, the trunk line 62 may be selected by the network gateway based on the alias address, which identifies the trunk lines 62 and is included as part of the output ATM setup message.

Once a trunk line is selected, the network gateway 30 establishes communication with the PSTN switch through such trunk line so that the telephony device 28, which is in communication with the PSTN 60, will ultimately be contacted so that a call or connection may proceed. As is illustrated, this provides the significant advantage of allowing VToA to be achieved while still providing accurate billing through the PSTN.

FIG. 6 is a flowchart that illustrates a method 600 for providing VToA and alias addressing using an intelligent network and a switched virtual circuit over an ATM network. The method 600 starts at 602 and proceeds to block 604 where an input ATM setup message is intercepted from an ingress ATM edge switch of an ATM network. In a preferred embodiment, the input ATM setup message is intercepted from a device side of the ingress ATM edge switch.

The method 600 proceeds next to block 606 where information is extracted from the input ATM setup message. This may include any of various information that is provided in various parameters or fields of the input ATM setup message. For example, a VToA designator and a called party phone number value may be extracted from the input ATM setup message.

The method 600 proceeds next to block 608 where the information is analyzed to determine if the input ATM setup message is requesting to establish an SVC for VToA. If so, further processing occurs as will be described below in another embodiment. The analysis or acts performed in block 608 may, for example, include comparing the value or address provided in the called party number parameter of the input ATM setup message. In a preferred embodiment, the VToA designator will be stored in the called party number parameter of the input ATM message.

Proceeding next to block 610, an alias ATM address of a called party CPE is generated (which could also be phrased “determined” or “located” instead of generated). The alias ATM address of the called party CPE will correspond to or identify (i) a network gateway in communication with a PSTN switch through a plurality of trunk lines, and (ii) a designated trunk line of the plurality of trunk lines. This will ultimately ensure that the VToA call is routed through a designated trunk line, which will result in the PSTN switch calculating a correct bill. Of course, in order for alias addressing to function properly, the called party CPE or network gateway must be capable of receiving and being identified by multiple alias ATM addresses, and the called party CPE or network gateway must be capable of selecting an appropriate trunk line of the available plurality of trunk lines between the network gateway and a corresponding PSTN switch.

The alias ATM address may be generated, determined or located using virtually any parameter or variable, either alone or in combination. In one embodiment, the called party phone number value is used to search a database or table to locate a corresponding alias ATM address of the called party CPE. In another embodiment, the called party phone number value is used to identify the called party CPE and, a calling party phone number value is used to determine the appropriate trunk line so that an appropriate or agreed upon billing rate will be applied by the PSTN. It should be understood, though, that virtually any available information, even the time of day the call is made, to generate the alias ATM address of the called party CPE or network gateway.

In an alternative embodiment, the method 600 may, using the intelligent network, determine that the called party phone number should be translated, forwarded, or associated with another called party phone number. In such a case, the method 600 will determine the “new” called party phone number, which may be used in place of the original called party phone number.

The method 600 proceeds next to block 612, where an output ATM setup message is generated that includes the alias ATM address of the called party CPE that identifies the CPE or network gateway and the desired trunk line to communicate with the PSTN. It should also be noted that any of a variety of intelligent network telephony services and features may be provided at or before block 612. It should also be noted that a calling party phone number value and an ATM address of calling party CPE may also be provided in the input ATM setup message, as part of the information generated at block 606, and in determining how such intelligent network VToA services and features should be carried out. At block 612, the called party phone number value will also, preferably, be provided as part of the output ATM setup message that is generated.

Proceeding next to block 614, the output ATM setup message is communicated to the ingress ATM edge switch of the ATM network. In a preferred embodiment, the output ATM setup message is received at a network side of the ingress ATM edge switch. The output ATM setup message is then routed or communicated through the ATM network until it reaches a corresponding egress ATM edge switch. The method 600 ends at block 616.

In a preferred embodiment, the blocks 604, 606 and 612 are performed using an ATM signaling intercept processor. Similarly, in a preferred embodiment, the analysis performed in the blocks 608, 610 and any applicable intelligent network VToA services and features are performed using a multi-service control point. Although not required, in a preferred embodiment, the input ATM setup message will include the VToA designator stored in the called party number parameter, the called party phone number value stored in the called party subaddress parameter, the ATM address of the calling party CPE stored in the calling party number, and the calling party phone number value stored in the calling party subaddress parameter. Similarly, the output ATM setup message will include the alias ATM address of the called party CPE stored in the called party number parameter, the called party phone number value stored in the called party subaddress parameter, the ATM address of calling party CPE stored in the calling party number, and the calling party phone number value stored in the calling party subaddress.

FIGS. 7 a and 7 b are flowcharts that illustrate a method 700 for providing VToA and alias addressing using an intelligent network and a switched virtual circuit over an ATM network, according to another aspect of the present invention. The method 700 begins at block 702 and proceeds to block 704. At block 704 a request to make a VToA call is received at an ingress CPE that includes a called party phone number value. In one embodiment, a telephone or computer configured with telephony software is used to request a VToA call that is received at the CPE, which may be implemented in one embodiment as an enterprise gateway. Thus, the enterprise gateway would receive the request to make the VToA call from the telephony device.

At block 706, an input ATM setup message is generated at the CPE. Although any of a variety of values may be generated in connection with the input ATM setup message, a called party phone number and a VToA designator are stored in designated parameters of the input ATM setup message, as it is generated.

The method 700 proceeds next to block 708 where the input ATM setup message is provided from the ingress CPE and is received at an ingress ATM edge switch. This ingress ATM edge switch may be considered to be part of the ATM network. At block 710, the input ATM setup message is intercepted from the ingress ATM edge switch. This will preferably be achieved using an ATM signaling intercept processor.

The method 700 proceeds next to block 712 where information is extracted from the input ATM setup message. Generally, this information will include the VToA designator and the called party phone number, which were stored and/or generated with the input ATM setup message at block 706. In a preferred embodiment, the VToA designator value will be stored in the called party number parameter of the input ATM setup message, and the called party phone number value will be stored in the called party subaddress parameter of the input ATM setup message. In a preferred embodiment, the acts described in block 712 may be performed by the ATM signaling intercept processor. Once the information has been extracted, the method 700 proceeds next to block 714. At block 714, the information is analyzed to determine if the VToA designator is present. In a preferred embodiment, this will be performed by a multi-service control point. If the VToA designator is found or is present in the information extracted from the input ATM setup message, this indicates that a request is being made for a VToA call using an SVC of the ATM network.

Proceeding next to block 716, an alias ATM address of a called party CPE is generated (which could also be phrased “determined” or “located” instead of generated) using the called party phone number value. The alias ATM address of the called party CPE will correspond to or identify (i) a network gateway in communication with a PSTN switch through a plurality of trunk lines, and (ii) a designated trunk line of the plurality of trunk lines. This will ultimately ensure that the VToA call is routed through a designated trunk line, which will result in the PSTN switch calculating a correct bill. Of course, in order for alias addressing to function properly, the called party CPE or network gateway must be capable of receiving and being identified by multiple alias ATM addresses, and the called party CPE or network gateway must be capable of selecting an appropriate trunk line of the available plurality of trunk lines between the network gateway and a corresponding PSTN switch.

The alias ATM address may be generated, determined or located using the called party phone number value and virtually any parameter or variable, either alone or in combination. In one embodiment, the called party phone number value is used to search a database or table to locate a corresponding alias ATM address of the called party CPE. In another embodiment, the called party phone number value is used to identify the called party CPE and, a calling party phone number value is used to determine the appropriate trunk line so that an appropriate or agreed upon billing rate will be applied by the PSTN. It should be understood, though, that virtually any available information, even the time of day the call is made, to generate the alias ATM address of the called party CPE or network gateway.

In an alternative embodiment, the method 700 may, using the intelligent network, determine that the called party phone number should be translated, forwarded, or associated with another called party phone number. In such a case, the method 700 will determine the “new” called party phone number, which may be used in place of the original called party phone number.

Before proceeding to block 716, it should be noted that any of a variety of known or available intelligent network services and features may be provided at this time. Generally, it is preferable to perform as much processing for such intelligent network services and features at the ingress side of the connection. The available intelligent network services and features may be determined by any of a variety of means such as by a user profile, a group profile, the attributes of the calling party phone number, the attributes of the called party phone number, or the ATM addresses of the ingress and egress CPEs.

At block 718, an output ATM setup message is generated that includes the called party phone number value and the alias ATM address of the called party CPE that corresponds to a network gateway and a designated trunk line. This output ATM setup message will preferably include the alias ATM address of the called party CPE stored in the called party number parameter of the output ATM setup message, and the called party phone number value stored in the called party subaddress parameter of the output ATM setup message. This will preferably be performed by the ATM signaling intercept processor.

The method 700 proceeds next to block 720 where the output ATM setup message is communicated to the ingress ATM edge switch of the ATM network. At block 722, the output ATM setup message is eventually received at an egress ATM edge switch. At this point, the output ATM setup message will be intercepted by the intelligent network, which will preferably be an ATM signaling intercept processor associated with the egress ATM edge switch. This is indicated in block 724. The method 700 proceeds next to block 726.

At block 726, information is extracted from the output ATM setup message, and may be referred to as egress information. The egress information will generally include the alias ATM address of the called party CPE. At block 728, the ATM setup message is communicated to the egress ATM edge switch, so that the ATM setup message may be communicated to the called party CPE, which may be implemented as a network gateway, at block 730. It should be noted that the acts performed at block 724 through 728 may be performed by an intelligent network, as described throughout. At block 732, the designated trunk line between the called party CPE and the switched PSTN is selected to establish communications between the called party CPE and the PSTN switch, based on the alias ATM address of the called party CPE. The method 700 ends at block 734.

Thus, it is apparent that there has been provided, in accordance with the present invention, an intelligent network and method for providing VToA and alias addressing that provides improved performance and that satisfies one or more of the advantages set forth above. The present invention provides advanced intelligent network services and features that dramatically increase the attractiveness of using VToA by providing the advanced services and features, with little administrative burden or expense to maintain, while also ensuring accurate billing when providing VToA connections with called parties connected through the PSTN. Although the preferred embodiment has been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of the present invention, even if all of the advantages identified above are not present. For example, although the focus herein is primarily on VToA and alias addressing, however, application to other packet-switched telecommunications technologies, both individually and collectively, may apply also to any of the technologies mentioned above or similar technologies. Also, the techniques, systems, sub-systems, and methods described and illustrated in the preferred embodiment as discrete or separate may be combined or integrated with other systems, modules, techniques, or methods without departing from the scope of the present invention. For example, the ATM signaling intercept processor and the multi-service control point may be implemented separately or together, or may by directly coupled to each other or could be coupled through some other interface and are not considered directly coupled to each other but may still be in communication with one another. Other examples of changes, substitutions, and alterations are readily ascertainable by one skilled in the art and could be made without departing from the spirit and scope of the present invention. 

1. A method, comprising: receiving, at a network device, from a calling party location, an input setup message that includes a called party phone number value; determining, at the network device, whether the input setup message includes a voice telephony over asynchronous transfer mode (VToA) designator; generating, at the network device, an output setup message including an alias address associated with a network gateway that is in communication with a public switched telephone network (PSTN) switch through a plurality of trunk lines when it is determined that the input setup message includes a VToA designator, where the alias address is based on the called party phone number value and indicates a desired trunk line of the plurality of trunk lines; and transmitting, by the network device, the output setup message, the output setup message causing the selection of the desired trunk line of the plurality of trunk lines in order to establish communication between the calling party location and the PSTN switch.
 2. The method of claim 1, where the input setup message includes a calling party phone number value.
 3. The method of claim 1, where the input setup message includes an asynchronous transfer mode (ATM) address of a calling party associated with the input setup message.
 4. The method of claim 1, where the input setup message includes a called party phone number value stored in a called party subaddress parameter, and the VToA designator stored in a called party number parameter,
 5. The method of claim 4, where the input setup message further includes the calling party phone number value stored in a calling party subaddress parameter, and an ATM address of a calling party associated with the input setup message stored in a calling party number parameter.
 6. The method of claim 1, where the output setup message includes a called party phone number value stored in a called party subaddress parameter, the alias address stored in a called party number parameter, a calling party phone number value stored in a calling party subaddress parameter, and an ATM address of the calling party associated with the input setup message stored in a calling party number parameter.
 7. The method of claim 6, where generating an output setup message including an alias address further comprises identifying the alias address associated with the network gateway using the called party phone number value and indicating a desired trunk line of the plurality of trunk lines in a database of alias addresses based on the calling party phone number value.
 8. The method of claim 1, where generating an output setup message including an alias address further comprises locating the alias address in a database of alias addresses based on the called party phone number value.
 9. The method of claim 1, further comprising: determining if the input setup message includes a request for a voice telephony over ATM switched virtual circuit based on the VToA designator.
 10. The method of claim 1, where the input setup message is received from an enterprise gateway.
 11. The method of claim 1, further comprising: identifying a modified called party phone number based on the called party phone number value; generating the alias address based on the modified called party phone number; and including the modified called party phone number and the alias address in the output setup message.
 12. The method of claim 1, where the input setup message is generated by a first telephony device associated with a calling party.
 13. The method of claim 1, where the designated trunk line is associated with a second telephony device associated with a called party.
 14. An apparatus for providing voice telephony over asynchronous transfer mode (VToA) services and alias addressing using an input asynchronous transfer mode (ATM) switched virtual circuit, comprising: a multi-service control point to receive an input setup message from a calling party, the input setup message including a called party phone number value, the multi-service control point to: determine whether the input setup message includes a VToA designator, identify a request for VToA services based on the input setup message when the input setup message includes a VToA designator, and upon identification of such request, generate an output message including an alias address based on the called party phone number value and associated with a network gateway that is in communication with a PSTN switch through a plurality of trunk lines, and where the alias address indicates a desired trunk line of the plurality of trunk lines.
 15. The apparatus of claim 14, where the VToA designator is stored in a called party number parameter in the input setup message.
 16. The apparatus of claim 14, where the alias address is based on the called party phone number value and a calling party phone number value included in the input setup message.
 17. The apparatus of claim 14, where the multi-service control point generates a modified called party phone number value based on the called party phone number value included in the input setup message, and where the alias address is based on the modified called party phone number value.
 18. A method, comprising: intercepting an input asynchronous transfer mode (ATM) setup message from an ingress ATM edge switch of the ATM network; determining whether the input ATM setup message includes a voice telephony over ATM (VToA) designator; determining, when the ATM setup message includes a VToA designator, whether the input ATM setup message includes a request for a VToA switched virtual circuit; and generating, when the input ATM setup message includes a request for a VToA switched virtual circuit, an output ATM setup message including an alias ATM address associated with a network gateway and designating a selected trunk line from among a plurality of trunk lines connecting a PSTN switch to the network gateway, where the selected trunk line is associated with a called party; and transmitting the output ATM setup message to the ingress ATM edge switch of the ATM network.
 19. The method of claim 18, where the VToA designator is stored in a called party number parameter in the input ATM setup message.
 20. The method of claim 18, where the alias ATM address is generated based on a called party phone number value and a calling party phone number value in the input ATM setup message. 